Feed and guide roller for cinematograph apparatus



w. scuPlN 2,163,470

FEED AND GUIDE ROLLER FOR CINEMATOGRAPH APPARATUS June 20, 1939.

Filed Nov. 23, 1957 Patented June 20, 1939 UNITED STATES PATENT OFFICE FEED AND GUIDE ROLLER FOR CINEMAT- OGRAPH APPARATUS Werner Scupin, Namslau, Silesia, Germany 1 Claim.

This invention relates to feed and guide rollers for cinematograph apparatus.

In connection with cinematograph film strips and band-form sound supports for electro-magnetic phonograph machines, a uniform feed velocity is of considerable importance. It has therefore been proposed heretofore to construct feed rollers partly of rigid material and partly of flexible material so that besides ensuring the speed of advance they are able to establish a satisfactory degree of friction with the film band to feed it forwards without the use of perforations therein. These well-known rollers of rigid material with an elastic insertion at the periphery have the drawback that the elastic portion cannotyield laterally and therefore assumes undesirable shapes when compressed. There exists the risk that the elastic material will be squeezed between the band and the metallic base with the result that the speed of advance is altered, even if only to a small extent.

This defect is overcome by the invention which consists in arranging the elastic portion on the roller in such a way that it can give or yield laterally when under pressure; accordingly the roller comprises an elastic portion of larger diameter and a non-yielding portion of small diameter which is recessed at its circumference at the sides of the elastic portion. This portion of smaller diameter provides the guiding and supporting surface determining the effective diameter which remains constant, whilst its recesses make provision for the elastic portion to yield laterally therein.

An embodiment of the object of the invention is illustrated in section in the drawing.

The roller consists of the rigid portion I, having a circumferential recess l', within which is seated the elastic portion 3. At the sides of the elastic portion 3, the side Walls of the recess I are partly cut away to provide recesses 2 which are made large enough to allow the flexible portion 3 to yield laterally within these recesses when under pressure against the band 4, notwithstanding the fact that it has a greater diameter than the rigid portion. Consequently the 10 eifective diameter in use is determined by the rigid portion, and is invariable.

In cutting away the side walls of the recess I to form the recesses 2, preferably sloping shoulders 5 are provided, which support the laterally 15 spreading elastic material when the portion 3 is compressed by its contact with the film 4.

Having thus described my said invention what I claim is new therein and desire to secure by Letters Patent is:

A feed and guide roller for cinematograph apparatus wherein the driving friction between the film and roller is produced by elastic material, said roller including a rigid portion having a circumferential recess and further including an an- 25 nular elastic portion of larger diameter than the rigid portion and seated in said recess, the side walls of said recess being partly cut away to provide an annular space and sloping shoulder at each side of the elastic portion to receive and 30 support a part of the latter when compressed by its contact with the film, the rigid portion providing the guiding and supporting surface for the film and determining the invariable effective diameter of the roller.

WERNER SCUPIN. 

